Use cron job to cleanup log files

Linux system various kinds logs and tmp generated in /var/log/, /tmp, How to clean these files automatically?

Using tmpwatch to automate temporary file cleanup

first we need install the 3rd tool tmpwatch

yum install tmpwatch -y

once tmpwatch is installed run command

/usr/sbin/tmpwatch -am 12 /tmp

this will delete all files over 12 hours old

next, we will configure your server to do this automatically.

from SSH type: crontab -e

go to the very bottom and paste

0 4 * * * /usr/sbin/tmpwatch -am 12 /var/log

For more daily job script:

$ cat /etc/cron.daily/tmpwatch

/usr/sbin/tmpwatch "$flags" -x /tmp/.X11-unix -x /tmp/.XIM-unix \
    -x /tmp/.font-unix -x /tmp/.ICE-unix -x /tmp/.Test-unix 240 /tmp
/usr/sbin/tmpwatch "$flags" 720 /var/tmp
for d in /var/{cache/man,catman}/{cat?,X11R6/cat?,local/cat?}; do
  if [ -d "$d" ]; then
    /usr/sbin/tmpwatch "$flags" -f 720 "$d"

-x is an entry to be excluded from the clean up operation.

Using a shell script do the same thing if none tmpwatch

find /var/log -type f -name "*.tmp" -exec rm {} \+

Normally we can execute as find /path -name "*.tmp" -exec rm {} \;
This may sometimes fail to work because the argument list may grow larger (in bytes) than the maximum allowed by the shell (getconf ARG_MAX). This may be solved by xargs with the -L option.

Also configure as a cron job to run automatically.

find /var/log -type f -mtime +12 -print0 | xargs -0 -L 5000 rm

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